Improvement in machine for double-seaming sheet-metal



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Letters Patent N o. 93,704, dated Aid/ust 17, 1869.

IMPROVEMENT INMACHINE FOR DOUBLE-SEAMING- SHET-METAL.

The Schedule referred to in these Letters Patent and making part of the same.

Be it known that I, JAMES GLOBER, ot Omaha City, Douglas county, State of Nebraska, have invented a new and useful Machine for Double-Seaming Sheet-Metal and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which- Figure l is a plane view on the bottom Figure 2, a side elevation; and

Figure 3, a diagram, showing the metal after the double seam is perfected.

The construction and operation of said machine, I will proceed to explain.

a is the main frame, resting upon the axles of the wheels b, and bearing the metal rollers 1, 2, 3, 4, 5,

and 6, which rollers are attached to vertical shafts passing up through both sections of the frame, as shown in iig. 2, and turn in suitable journals or boxes.

This machine is intended more particularly to double over the two edges of long strips of tin for roofing, as is shown in iig. 3.

rlhe mode of operation is about as follows:

The tin or metal is first nailed down in its place on the roof, in long strips, side by'side, with their edges turned up ati-ight angles, touching each other. The frame of the machine is then raised up by means of pressing down on the outer end of the lever s, which, in conjunction with the levers 1 and t, and the upright posts n, through the lower ends of which the axles pass, until the axles touch thelower part of the long journals or boxes o. .This is doue'so that the rollers l and 6 (between which the tin first starts) catch the two turned-up edges ofthe tin near the top, and start the first turn. The roller l is constructed ywith two vertical offsets, into the first one of which the roller 6 operates, as is shown in ti g. 2. The tin passing through between said rollers, leaves them bent into the shape of a iight angle, the rim :l: serving to gauge the depth of their grip on the tin. llhe machine then passes on until the turnededge of the tin comes between the two next rollers, 2 and 5, so that`the edge of the tin strikes the conical surface of the roller 5, shown also in iig. 2, by the dotted lines on the roller 2,'which changes the angle into which the two edges were just turned from a right angle into an acute angle, so that when it comes between the two parallel vertical rollers 3 and 4, they complete the turn, by pressing the two surfaces together, as shown in fig. 3.

In order to make the second or double turn, the

same operation is repeated, after the frame is letdown,

so that it rests on the axles of the wheels b.

The machine is propelled by pushing on the crossbar z. rlhe end which passes through the levers only is shown.

The system of leverage is the same on both sides of the machine.

The boxes m and e are movable, as shown in iig. l, for the purpose of setting the rollersnearer together or further apart, as desired, which is aeeomplished'by means of the thumb-screw c.

A strip of rubber, n., is placed between the boxes m and the main frame a', so the boxes will be flexible, that the cross-seams in the tin may pass between the rollers without difficulty.

, rlhe boxes may be similarly arranged in the upper section of the ii'aine, if desired.

Having thus described my invention,

What I desire to secure by Letters Patent is as follows:

I claim the combination of the levers s, lr, and t, posts u, and long box o, with the main frame a, arranged, operating, and constructed as and for the purposes set forth.

' JAMES GLOBER.

-Witnesses Y ATiros. 1I. Hn'renixs, H. Lowe. 

